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Pollination by nectar‐foraging pompilid wasps: a new specialized pollination strategy for the Australian flora

The Pompilidae is a cosmopolitan and diverse group of wasps, which commonly feed on nectar. However, pollination systems specialized on pompilids have not been documented in detail outside of southern Africa. Here, we studied Caladenia drummondii (Orchidaceae) where, based on floral traits and preli...

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Published in:Plant biology (Stuttgart, Germany) Germany), 2021-09, Vol.23 (5), p.702-710
Main Authors: Phillips, R. D., Bohman, B., Peakall, R., Dafni, A.
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description The Pompilidae is a cosmopolitan and diverse group of wasps, which commonly feed on nectar. However, pollination systems specialized on pompilids have not been documented in detail outside of southern Africa. Here, we studied Caladenia drummondii (Orchidaceae) where, based on floral traits and preliminary field observations, we predicted pollination by sexual deception of male pompilid wasps. Detailed pollinator observations were undertaken using floral baiting experiments at sites spanning 375 km. Following evidence for nectar on some flowers of C. drummondii, the sugar content on the labellum was analysed by GC‐MS. Floral spectral reflectance was measured and compared with Caladenia using other pollination strategies. Males of a single species of pompilid wasp (Calopompilus sp.) were the only visitors capable of pollinating C. drummondii. Attempts to feed from the surface of the labellum were frequent and were associated with removal and deposition of pollinia. GC‐MS analysis revealed larger quantities of sugar on the labellum than reported in other Caladenia species. While no sexual or courtship behaviour was observed, the zig‐zag and circling flight on approach to the flower is suggestive of odour‐based attraction. Floral spectral reflectance was similar to sexually deceptive Caladenia. This study represents the first confirmation of a specialized pompilid pollination system outside of Africa. Although pollination occurs during nectar‐foraging, long‐distance sexual attraction cannot be ruled out as an explanation for the exclusive male visitation. The similarity in floral spectral reflectance to other Caladenia indicates colour may not impose a constraint on the evolution of pollination by pompilids. Caladenia drummondii (Orchidaceae) is pollinated by nectar foraging pompilid wasps, which is the first such system to be discovered in Australia.
doi_str_mv 10.1111/plb.13286
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source Wiley-Blackwell Read & Publish Collection
subjects Attraction
Baiting
Botanik
Botany
colour
Courtship
Ecology
Ekologi
Flora
Flowers
Males
Nectar
orchid
Plant nectar
Plant reproduction
Pollination
Pollinators
Pompilidae
Reflectance
Sexual behavior
specialized
Spectra
Spectral reflectance
title Pollination by nectar‐foraging pompilid wasps: a new specialized pollination strategy for the Australian flora
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